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The numerical simulation of ice accretion on aircraft is a complex problem that is difficult to simulate robustly, especially in 3D. The process, which combines multiple different solvers, is prone to fail whenever the geometry deformation due to ice is too complex. Thus, the more ice layers, the more fragile is the simulation. This paper aims at studying, and possibly reducing, the dependency on the number of layers by considering i) the impact of the deforming surface on the impingement and ii) a local roughness modeling that can better position the ice horns. The method called Impact Angle Correction (IAC) method in the literature is implemented and consists in setting in an additional loop the components solved on the surface, namely the thermodynamic exchanges and the geometry update, to consider the change in the surface normal vectors.